“It is easy to boo, but it is harder to look your kids in the face if we are living under a Trump presidency,” the senator told the crowd. “Politics is not easy stuff. You don’t get everything you want tomorrow — ask the people who fought in the civil rights movement.”

Sanders’s campaign was based on the idea that we need a political revolution that will get people more involved in their government and will make elected officials less reliant on big donors to fund campaigns.

Given this, it’s been hard for some Sanders supporters to accept the nitty-gritty realities of politics that Sanders has preached since he endorsed Hillary Clinton. Nonetheless, Sanders will likely keep making his case for electing Clinton from now all the way until November.